I am not scared of spiders or snakes, I live in an area where I see Black Widows around the house every couple days and I am not freaked out at all. But like you, get me high up in a building and just looking down outside I totally freak out internally. This is extremely common.
As long as it doesn't affect your life EVERY single day to the point where your suffering, you'd be OK. If it is causing you significant problems, then I guess you could help with it although I'm not sure I would want to go through with trying to break the phobia; it would be quite painful!